CN113948350A - Small-sized circuit breaker - Google Patents

Abstract

The invention relates to the field of low-voltage electrical appliances, in particular to a miniature circuit breaker, which comprises a circuit breaker shell, an overload protection mechanism, a moving contact, a static contact and an operating mechanism, wherein the overload protection mechanism is respectively arranged in the circuit breaker shell; the overload protection mechanism is in driving fit with the operating mechanism, and the moving contact is in driving connection with the operating mechanism; the overload protection mechanism comprises a first current-conducting plate, a first connecting plate and a bimetallic strip, wherein two ends of the first connecting plate are respectively connected with the first current-conducting plate and the bimetallic strip; the bimetallic strip is connected with the first current conducting plate through a first flexible connection and is connected with the static contact through a second flexible connection; a third flexible connection is optionally arranged between the first conductive plate and the fixed contact; the overload protection mechanism of the miniature circuit breaker can be used for protecting overload currents of more specifications.

Description

Small-sized circuit breaker

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a miniature circuit breaker.

Background

The use of the circuit breaker can effectively improve the use safety of electrical equipment, and the circuit breaker is widely applied at present, but the existing circuit breaker mostly has the following problems:

firstly, the existing circuit breakers are generally arranged in a distribution box, and when a circuit breaks down and needs to be overhauled or a failed circuit breaker needs to be replaced, an operator needs to check the circuit breakers arranged on the circuit step by step, which is relatively complicated; especially for the plug-in circuit breaker, it is generally installed in the cabinet, and the installation quantity is more, when overhauing, changing the trouble circuit breaker or looking for specific circuit breaker or judging the circuit breaker state, need consume great time and energy, influenced the efficiency of overhauing or looking for or judging, and there is certain potential safety hazard.

Secondly, when the circuit breaker is used on some equipment with a narrow specific space, the circuit breaker has the defects that the circuit breaker cannot be installed or has higher installation cost and the like.

Thirdly, the signal output assembly of the circuit breaker can only output a single type of signal and cannot meet the requirement; and the mounting reliability of the signal output component is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a miniature circuit breaker, wherein an overload protection mechanism of the miniature circuit breaker can be used for protecting overload current of more specifications.

In order to achieve the purpose, the invention adopts the following technical scheme:

a miniature circuit breaker comprises a circuit breaker shell 2, an overload protection mechanism 2a, a moving contact 1-1a, a static contact 1-0a and an operating mechanism 4, wherein the overload protection mechanism 2a is respectively arranged in the circuit breaker shell 2; the overload protection mechanism 2a is in driving fit with the operating mechanism 4, and the moving contact 1-1a is in driving connection with the operating mechanism 4;

the overload protection mechanism 2a comprises a first conductive plate 20a, a first connecting plate 22a and a bimetallic strip 23a, wherein two ends of the first connecting plate 22a are respectively connected with the first conductive plate 20a and the bimetallic strip 23 a; the bimetallic strip 23a is connected with the first conductive plate 20a through a first flexible connection 240a and is connected with the static contacts 1-0a through a second flexible connection 241 a; a third flexible connection 242a is optionally provided between the first conductive plate 20a and the stationary contacts 1-0 a.

Preferably, the overload protection mechanism 2a further includes an adjusting screw 21a, the adjusting screw 21a is disposed on the first conductive plate 20a and is in threaded connection therewith, and one end of the adjusting screw 21a is opposite to and matched with the first connection plate 22 a.

Preferably, the circuit breaker housing 2 includes an operation hole 22 corresponding to the other end of the adjustment screw 21 a; the first connection plate 22a has one end connected to the middle of the first conductive plate 20a and the other end connected to one end of the bimetal 23 a.

Preferably, the static contact 1-0a comprises a static contact plate 1-00a and a static contact 1-01a arranged at one end of the static contact plate 1-00a, and the static contact plate 1-00a is connected with the bimetallic strip 23a through a second flexible connection 241 a; a third flexible connection 242a is optionally provided between the first conductive plate 20a and the stationary contact plates 1-00 a.

Preferably, the first connecting plate 22a and the bimetallic strip 23a are integrally formed into a C-shaped structure, an opening side of the C-shaped structure faces the operating mechanism 4, and the first conductive plate 20a and the static contacts 1-0a are arranged on the other side of the C-shaped structure; one end of the first conductive plate 20a is connected with an external load through a second terminal 3a, the other end is opposite to one end of a static contact plate 1-00a of a static contact 1-0a, and the other end of the static contact plate 1-00a is provided with a static contact 1-01 a.

Preferably, the operating mechanism 4 includes a handle member 44, a second connecting rod 45, a rotating plate 43, a locking member 41 and a tripping member 42, the handle member 44 and the rotating plate 43 are respectively rotatably disposed on the circuit breaker housing 2, the locking member 41 and the tripping member 42 are respectively rotatably disposed on the rotating plate 43 and are in locking engagement, and the handle member 44 is connected with the locking member 41 through the second connecting rod 45; the bimetal strip 23a is in driving fit with the snap 42.

Preferably, the trip buckle 42 is a V-shaped structure, the middle part of the trip buckle is rotatably disposed on the circuit breaker housing 2, one end of the trip buckle is provided with a trip buckle driven column 40 in driving fit with the bimetallic strip 23a, and the other end of the trip buckle is in locking fit with the locking buckle 41.

Preferably, the miniature circuit breaker further comprises a short-circuit protection mechanism 6, and the short-circuit protection mechanism 6 is in driving fit with the tripping actuated post 40; the short-circuit protection mechanism 6 is a clapper type electromagnetic mechanism or a direct-acting type electromagnetic mechanism.

Preferably, the miniature circuit breaker further comprises an operating button 1, wherein one end of the operating button 1 is inserted into the breaker shell 2 and is in driving connection with a handle piece of the operating mechanism 4 through a first connecting rod; the operating button 1 is pressed/pulled to close/open the miniature circuit breaker through the operating mechanism 4.

The overload protection mechanism 2a of the miniature circuit breaker is used for not arranging a third soft connection 242a between a first conductive plate 20a and a static contact 1-0a when the miniature circuit breaker is in a small current specification (breaking small current) so as to meet the heating requirement of a bimetallic strip 23 a; when the overload protection mechanism 2a is used for a large-current specification, the first conductive plate 20a and the static contacts 1-0a are connected through the third flexible connection 242a, so that the heating requirement of the bimetallic strip 23a is met, and the intercepting section requirement of the flexible connection is also met.

Drawings

Fig. 1 is a schematic structural diagram of a miniature circuit breaker of the present invention, wherein a short-circuit protection mechanism is a clapper type electromagnetic mechanism;

fig. 2 is a schematic structural view of the miniature circuit breaker of the present invention, with a partition omitted as compared with fig. 1;

FIG. 3 is an enlarged schematic view of portion A of FIG. 1 in accordance with the present invention;

FIG. 4 is an enlarged schematic view of portion B of FIG. 2 in accordance with the present invention;

fig. 5 is a schematic structural diagram of a miniature circuit breaker according to the present invention, wherein the short-circuit protection mechanism is a direct-acting electromagnetic mechanism;

FIG. 6 is a schematic perspective view of a short-circuit protection mechanism according to the present invention, wherein the short-circuit protection mechanism is a clapper type electromagnetic mechanism;

FIG. 7 is a schematic side projection view of the short-circuit protection mechanism of the present invention, which is a clapper type electromagnetic mechanism showing at least the angle between the armature and the armature tension spring when the armature is attracted to the yoke;

FIG. 8 is a schematic diagram of an exploded structure of the short-circuit protection mechanism of the present invention, which is a clapper type electromagnetic mechanism;

fig. 9A is a schematic structural diagram of the overload protection mechanism according to the first embodiment of the present invention, in which the bimetal is connected to the first conductive plate through the first flexible connection, and is connected to the fixed contact through the second flexible connection, and the first conductive plate is connected to the fixed contact through the third flexible connection;

fig. 9B is a schematic structural diagram of a second embodiment of the overload protection mechanism according to the present invention, in which the bimetal is connected to the first conductive plate through a first flexible connection and connected to the fixed contact through a second flexible connection;

FIG. 10 is a schematic view of the construction of the separator of the present invention;

FIG. 11 is a schematic structural view of a signal output assembly of the present invention, showing at least the structure of one side of a printed circuit board;

fig. 12 is a schematic view of the construction of a signal output assembly of the present invention, showing at least the construction of the other side of the printed circuit board;

FIG. 13A is a schematic circuit diagram of a first embodiment of a signal output assembly of the present invention;

FIG. 13B is a schematic circuit diagram of a second embodiment of the signal output assembly of the present invention;

fig. 14 is a schematic view of the structure of the miniature circuit breaker of the present invention, showing at least a button viewing hole;

fig. 15 is a schematic view showing the structure of the signal lamp, the light guide member, the indicating member and the operation button in the opening state of the miniature circuit breaker according to the present invention;

FIG. 16 is a schematic structural view of a first embodiment of the light guide element of the present invention, showing the propagation path of the light emitted from the signal lamp in the light guide element when the miniature circuit breaker is in the open state;

fig. 17 is a schematic view of the structure of the driving member and the indicating member engaged with each other when the miniature circuit breaker of the present invention is in the open state;

fig. 18 is a schematic view of another angle engagement structure of the driving member and the indicating member when the miniature circuit breaker of the present invention is in the open state;

fig. 19 is a schematic view showing a structure of a signal lamp, a light guide member, an indicator and an operation button when the miniature circuit breaker of the present invention is in a closed state;

fig. 20 is a schematic structural view of a first embodiment of the light guide element of the present invention, showing a propagation path of light emitted from a signal lamp in the light guide element when the miniature circuit breaker is in a closed state;

fig. 21 is a schematic view of a structure of a driving member and an indicating member engaged with each other when the miniature circuit breaker of the present invention is in a closed state;

fig. 22 is a schematic view illustrating a structure of the driving member engaged with the indicating member at another angle when the miniature circuit breaker of the present invention is in a closing state;

FIG. 23 is a schematic view of the construction of an indicator of the present invention;

fig. 24 is a schematic view showing a structure of a signal lamp, a light guide member and an operation button in cooperation with the miniature circuit breaker according to the present invention in a closed state;

fig. 25 is a schematic view showing a structure of a signal lamp, a light guide member and an operation button which are engaged with each other when the miniature circuit breaker of the present invention is in an open state;

fig. 26 is a schematic view of the structure of the miniature circuit breaker of the present invention, showing at least the view port of the case;

fig. 27 is a schematic view showing a fitting structure of a signal lamp, a light guide member and a housing viewing hole of the miniature circuit breaker according to the present invention, wherein light emitted from the signal lamp is reflected once and then emitted out of the light guide member;

FIG. 28 is a schematic structural diagram of a second embodiment of a light guide element according to the present invention;

fig. 29 is a schematic view showing a fitting structure of a signal lamp, a light guide member and a housing viewing hole of the miniature circuit breaker according to the present invention, wherein light emitted from the signal lamp is reflected three times and then emitted from the light guide member;

fig. 30 is a schematic structural diagram of a light guide element according to a third embodiment of the present invention.

Detailed Description

The following description will further describe embodiments of the miniature circuit breaker according to the present invention with reference to the embodiments shown in fig. 1-30. The miniature circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1, 2, 5, 14, and 26, the miniature circuit breaker of the present invention includes a circuit breaker housing 2, an operation button 1, an operation mechanism 4, a moving contact 1-1a and a static contact 1-0a, an arc extinguish chamber 9, an overload protection mechanism 2a, and a short circuit protection mechanism 6, which are respectively disposed in the circuit breaker housing 2; the operation button 1 is arranged at one end of the breaker shell 2, and one end of the operation button 1 is inserted into the breaker shell 2 and is in sliding fit with the breaker shell 2; the operating button 1 is in driving connection with an operating mechanism 4, the operating mechanism 4 is in driving connection with a moving contact 1-1a, the operating button 1 is pressed/pulled, and the moving contact 1-1a and a static contact 1-0a are driven to be closed/opened through the operating mechanism 4, so that the miniature circuit breaker is switched on/off; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are respectively matched with the operating mechanism 4 in a driving way, and when the small circuit breaker has overload or short-circuit faults, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the operating mechanism 4 to act so as to open (or trip) the small circuit breaker; the arc extinguishing chamber 9 is used for extinguishing electric arcs generated when the moving contact 1-1a and the static contact 1-0a are closed or disconnected.

It should be noted that the arc chute 9, the overload protection mechanism 2a and the short-circuit protection mechanism 6 may be arranged or omitted according to actual needs, that is, the miniature circuit breaker may not be provided with one or more of the three. The miniature circuit breaker of the present invention preferably comprises an arc chute 9, an overload protection mechanism 2a and a short-circuit protection mechanism 6.

Preferably, as shown in fig. 1, 2 and 5, the internal layout of the miniature circuit breaker of the present invention is improved as follows: the overload protection mechanism 2a and the operating mechanism 4 are arranged in the middle of the breaker shell 2 in a stacking mode, and the operating button 1 is located on one side of the operating mechanism 4. Further, as shown in fig. 1, 2 and 5, the arc extinguishing chamber 9 and the short-circuit protection mechanism 6 are arranged side by side on the other side of the operating mechanism 4. Further, as shown in fig. 1, 2 and 5, the miniature circuit breaker of the present invention further comprises a first terminal 7 and a second terminal 3a respectively disposed at both ends of the breaker case 2; the second terminal 3a and the operating button 1 are located at the same end of the circuit breaker housing 2. The first wiring terminal 7 and the second wiring terminal 3a are respectively used as an input wiring terminal and an output wiring terminal of the miniature circuit breaker, one of the first wiring terminal 7 and the second wiring terminal 3a is connected with the static contact 1-0a, the other one is electrically connected with the moving contact 1-1a, the input wiring terminal is connected with a power supply, and the output wiring terminal is connected with an external load. In this embodiment, the first terminal 7 serves as an input terminal, the second terminal 3a serves as an output terminal, the first terminal 7 is connected with the moving contact 1-1a, the second terminal 3a is electrically connected with the static contact 1-0a, the second terminal 3a can also serve as an input terminal as required, and the first terminal 7 serves as an output terminal; the first terminal 7 can also be electrically connected with the static contact 1-0a, and the second terminal 3a can be connected with the movable contact 1-1 a. The miniature circuit breaker has the advantages that the internal layout is well designed, the layout is more reasonable, the internal space of the circuit breaker shell 2 is more fully utilized, the whole miniature circuit breaker is more compact, the overall specification of the miniature circuit breaker is favorably reduced, and the miniaturization development trend of the miniature circuit breaker is met.

Preferably, as shown in fig. 1 to 5, the miniature circuit breaker of the present invention further comprises a signal output assembly 8, the signal output assembly 8 and the first terminals 7 are located at the same end of the breaker housing 2, the signal output assembly 8 is located between two first terminals 7 arranged side by side, and the two first terminals 7 are used for connecting the L pole and the N pole of the power supply.

Preferably, as shown in fig. 13A and 13B, the signal output assembly 8 includes a first signal terminal 83, a current limiting resistor 85, a second signal terminal 82, and a diode 84; the first signal end 83 is electrically connected with the output wiring terminal through a current-limiting resistor 85; the second signal terminal 82 is electrically connected with an output terminal through a diode 84; alternatively, the second signal terminal 82 is connected to the output terminal of the circuit breaker through a current limiting resistor 85 and a diode 84 connected in series. In this embodiment, the second terminal 3a serves as an output terminal, the first terminal 7 is connected to the moving contact 1-1a, the second terminal 3a is electrically connected to the static contact 1-0a, the first signal terminal 83 is electrically connected to the static contact 1-0a through the current limiting resistor 85, and the second signal terminal 82 is electrically connected to the static contact 1-0a through the diode 84. The current limiting resistor 85 of the signal output component 8 can improve the total resistance value of the load of the first signal end 83, so that the situation that a signal end device is burnt by a temporary large current generated in the switching-on/switching-off process of the miniature circuit breaker (the movable contact 1-1a and the static contact 1-0a are closed/disconnected) is prevented; meanwhile, the current limiting resistor 85 also has a voltage dividing effect, so that the electric shock risk caused by mistakenly touching the second signal end 82 by a user or other personnel is avoided; when the current-limiting resistor 85 is connected in series between the output terminal of the circuit breaker and the diode 84, the voltage values at the first signal end 82 and the second signal end 83 can be reduced at the same time, so that the risk of electric shock caused by mistaken touch of a user or other personnel is reduced, and the situation that signal end equipment respectively connected with the first signal end 82 and the second signal end 83 is burnt is avoided; the diode 84 can filter the signal output from the second signal terminal 82, so that the ac signal is converted into a dc signal, and the signal output module 8 can output ac and dc signals respectively to meet different requirements.

As shown in fig. 1-3 and 11-12, the signal output assembly 8 includes a printed circuit board 80 and a first signal terminal 83 and a second signal terminal 82 respectively disposed on the printed circuit board 80, and the printed circuit board 80 is inserted into the circuit breaker housing 2. Further, as shown in fig. 11-12, the current limiting resistor 85 and the diode 84 are disposed on the printed circuit board 80. Further, as shown in fig. 11 to 12, the signal output assembly 8 further includes a contact terminal 81 for electrically connecting to an output terminal, for example, the contact terminal 81 is connected to the static contact 1-0a, or the contact terminal 81 is connected to an arc striking plate or a terminal plate connected to the static contact 1-0a, or connected to an arc striking plate or a terminal plate connected to the movable contact 1-1 a; the current limiting resistor 85 is connected in series between the contact terminal 81 and the first signal terminal 83, and the diode 84 is connected in series between the contact terminal 81 and the second signal terminal 82; alternatively, the current limiting resistor 85 and the diode 84 are connected in series between the contact terminal 81 and the second signal terminal 82, and the first signal terminal 83 is connected to a node between the current limiting resistor 85 and the diode 84. The signal output assembly 8 is an integrated component, and can be inserted on the circuit breaker housing 2 through the printed circuit board 80 to realize fixation and installation, and the contact terminal 81, the first signal end 83 and the second signal end 82 facilitate the wiring of the signal output assembly 8, so that the installation and wiring efficiency of the signal output assembly 8 is obviously improved, and the operation of a user is facilitated.

Preferably, as shown in fig. 1, 2 and 5, the operating mechanism 4 includes a latch 41 and a trip 42 that are in latching engagement, and the trip 42 includes a trip actuated post 40 that is in driving engagement with the overload protection mechanism 2a and the short-circuit protection mechanism 6, respectively. Further, as shown in fig. 1, 2 and 5, the overload protection mechanism 2a and the short-circuit protection mechanism 6 respectively push the jump buckle actuated column 40 from the same side of the jump buckle actuated column 40, so that the jump buckle 42 rotates and releases the locking engagement with the locking piece 41. Further, as shown in fig. 1 and 2, the middle of the jump buckle driven column 40 is connected with a jump buckle piece 42, one end of which is in driving fit with the overload protection mechanism 2a, and the other end of which is in driving fit with the short-circuit protection mechanism 6. According to the miniature circuit breaker, the overload protection mechanism 2a and the short-circuit protection mechanism 6 are in driving fit with the tripping actuated column 40, so that the miniature circuit breaker is switched off when overload or short-circuit faults occur in the miniature circuit breaker.

Preferably, as shown in fig. 1-2 and 6-8, the short circuit protection mechanism 6 is a clapper type electromagnetic mechanism, and includes a magnetic yoke 61, an armature 60, an armature tension spring 63 and a conductive plate 64, the conductive plate 64 is disposed in the middle of the magnetic yoke 61, one end of the armature 60 is rotatably disposed, the armature 60 is relatively matched with the magnetic yoke 61, one end of the armature tension spring 63 is connected with the armature 60, and the other end is fixedly disposed; the included angle between the axis of the armature tension spring 63 and the axis of the armature 60 is an acute angle. Further, as shown in fig. 7, when the armature 60 and the yoke 61 are attracted, an included angle between the axis of the armature tension spring 63 and the axis of the armature 60 is α, and α is greater than or equal to 3 ° and less than or equal to 30 °. In the short-circuit protection mechanism 6, the included angle between the axis of the armature tension spring 63 and the axis of the armature 60 is an acute angle, so that in the actuation process of the armature 60 and the magnetic yoke 61, the stretching amplification (or the pulling force amplification) of the armature tension spring 63 is small, the rapid actuation of the armature 60 and the magnetic yoke 61 is facilitated, and the breaking capacity of the miniature circuit breaker can be improved. Further, as shown in fig. 6 to 8, the armature 60 includes a plurality of hanging spring holes, the hanging spring holes are arranged side by side at intervals, and the hanging spring holes from the first to the last are offset in the direction of the armature tension spring 63 in sequence, so that the short-circuit protection mechanism 6 can adjust the suction force and the reaction force characteristics by adjusting the connection position of the armature tension spring 63 and the armature 60 (connected with the armature 60 through different hanging spring holes), thereby meeting the requirement of the small circuit breaker on the protection characteristics.

As shown in fig. 5, the short-circuit protection mechanism 6 of the miniature circuit breaker of the present invention may also be a direct-acting electromagnetic mechanism; the miniature circuit breaker of the invention preferably adopts the short-circuit protection mechanism 6 of a clapper type electromagnetic mechanism, thereby more conveniently adjusting the characteristics of suction force and counter force.

Preferably, as shown in fig. 1-2 and 9A-9B, the overload protection mechanism 2a includes a first conductive plate 20a, a first connection plate 22a and a bimetal 23a, and both ends of the first connection plate 22a are connected to the first conductive plate 20a and the bimetal 23a, respectively; the bimetallic strip 23a is communicated with the first conductive plate 20a through a first flexible connection 240a and is connected with the static contacts 1-0a through a second flexible connection 241 a; a third flexible connection 242a is optionally provided between the first conductive plate 20a and the stationary contacts 1-0 a. The overload protection mechanism 2a is used for not arranging a third soft connection 242a between the first conductive plate 20a and the static contact 1-0a when the specification of the small current (63A and below) is met so as to meet the heating requirement of the bimetallic strip 23A; when the overload protection mechanism 2a is used for a large current specification (a current value above 63A), the first conductive plate 20a and the static contact 1-0a are connected through the third flexible connection 242a, so that the heating requirement of the bimetallic strip 23A is met, and the intercepting section requirement of the flexible connection is also met. Further, as shown in fig. 9A-9B, one end of the first connection plate 22a is connected to the middle of the first conductive plate 20a, and the other end is connected to one end of the bimetal 23 a; the overload protection mechanism 2a further includes an adjusting screw 21a, the adjusting screw 21a is disposed on the first conductive plate 20a and is in threaded connection with the first conductive plate, and one end of the adjusting screw 21a is in relative fit with the first connecting plate 21 a. The adjusting screw 21a is arranged on the first conductive plate 20a, and compared with the mode that the adjusting screw 21a is arranged on the breaker shell 2 in the prior art, the situation that the position of the adjusting screw 21a is changed due to the fact that the breaker shell 2 is heated and deformed, and the overload characteristic of the breaker is unstable is avoided.

It should be noted that the first connecting plate 22a is generally made of materials such as brass and carbon steel, has a large internal resistance, a long length and a certain elasticity, and can well bear the acting force given by the adjusting screw 21a, so as to adjust the position of the bimetal 23a to adjust the overload characteristic of the circuit breaker; the first flexible connection 240a, the second flexible connection 241a and the third flexible connection 242a are made of good conductors, have the characteristics of short length, large section and small internal resistance, form three current channels and bear most of current.

Preferably, as shown in fig. 14 to 29, the miniature circuit breaker of the present invention further comprises a PCB board 7a and a light guide member 5a provided in the breaker housing 2, and a viewing hole; the PCB 7a is provided with a signal lamp 8a, one end of the light guide element 5a is correspondingly matched with the signal lamp 8a, and the other end of the light guide element is correspondingly matched with the observation hole. According to the miniature circuit breaker, the light guide element 5a can transmit light emitted by the signal lamp 8a to the observation hole, so that a user can conveniently observe the lighting state of the signal lamp 8a, the user can be prompted quickly when the miniature circuit breaker with faults is overhauled and replaced, a specific circuit breaker is searched or the state of the circuit breaker (opening/closing/tripping) is judged, the working efficiency is improved, and the personal safety of the user is ensured.

It should be noted that the indicator light 8a may be set to indicate an opening/closing state, a fault state, etc. of the miniature circuit breaker as needed, or perform a specific indication according to a control command.

Preferably, as shown in fig. 16, 20, 28-29, the light-guiding element 5a comprises at least one reflecting surface for reflecting light of the signal 8a, which light of the signal 8a reaches the viewing aperture after at least one reflection. Further, as shown in fig. 16, 20, and 28-29, the direction in which the light of the traffic light 8a enters the light guide element 5a is a first direction, and the direction in which the light of the traffic light 8a exits the light guide element 5a is a second direction, and the first direction is perpendicular to the second direction. Preferably, as shown in fig. 16, 20, and 28 to 29, the light guide element 5a includes 2n +1 reflecting surfaces, where n is a natural number.

The following is one embodiment of the miniature circuit breaker of the present invention.

As shown in fig. 1, 2 and 5, the miniature circuit breaker of the present invention includes a circuit breaker housing 2, an operation button 1, an operation mechanism 4, a moving contact 1-1a and a static contact 1-0a, an overload protection mechanism 2a, a short circuit protection mechanism 6, an arc extinguish chamber 9, a first terminal 7 and a second terminal 3a, which are respectively disposed in the circuit breaker housing 2; the operating button 1 is pressed/pulled to close/open the miniature circuit breaker through the operating mechanism 4.

Preferably, as shown in fig. 1, 2 and 5, the operating button 1 is arranged at one end of the circuit breaker housing 2, and one end of the operating button 1 is inserted into the circuit breaker housing 2 and is in sliding fit with the circuit breaker housing 2; the first terminal 7 and the second terminal 3a are respectively arranged at two ends of the breaker shell 2, and the second terminal 3a and the operating button 1 are arranged at one end of the breaker shell 2 side by side; the overload protection mechanism 2a and the operating mechanism 4 are arranged in the middle of the breaker shell 2 in a laminated mode, and the short-circuit protection mechanism 6 and the arc extinguish chamber 9 are arranged side by side and located between the operating mechanism 4 and the first terminal 7; the operating button 1 and the short-circuit protection mechanism 6 are opposite and respectively located on two sides of the operating mechanism 4, and the second terminal 3a and the arc extinguishing chamber 9 are opposite and respectively located on two sides of the operating mechanism 4.

Preferably, the first terminal 7 is an incoming terminal of the miniature circuit breaker, and the second terminal 3a is an outgoing terminal of the miniature circuit breaker. Further, as shown in fig. 1 and 2, the miniature circuit breaker of the present invention is a two-phase miniature circuit breaker, and two first terminals 7 are arranged side by side at an interval at one end of the breaker case 2, and two second terminals 3a are arranged side by side at an interval at the other end of the breaker case 2.

Specifically, as shown in fig. 1, 2 and 5, the directions of the upper, lower, left and right sides and the side facing the reader of fig. 1, 2 and 5 are the upper, lower, left, right and front sides of the miniature circuit breaker; the operating button 1 is arranged at the upper end of the breaker shell 2, and the lower end of the operating button 1 is inserted into the breaker shell 2 and is in sliding fit with the breaker shell 2; the second terminal 3a and the first terminal 7 are respectively arranged at the upper end and the lower end of the breaker shell 2, and the second terminal 3a and the operating button 1 are arranged at the upper end of the breaker shell 2 in a left-right side-by-side mode; the overload protection mechanism 2a and the operating mechanism 4 are arranged in the middle of the breaker shell 2 in a front-back stacking mode, and the arc extinguish chamber 9 and the short-circuit protection mechanism 6 are arranged side by side on the left and right sides and are located between the operating mechanism 4 and the first wiring terminal 7; the operating button 1 and the short-circuit protection mechanism 6 are opposite and are respectively positioned at the upper side and the lower side of the operating mechanism 4, and the second wiring terminal 3a and the arc extinguish chamber 9 are opposite and are respectively positioned at the upper side and the lower side of the operating mechanism 4.

Preferably, as shown in fig. 1 and 10, the miniature circuit breaker of the present invention further comprises a partition plate 3, the breaker housing 2 comprises a housing base, the operating mechanism 4 is disposed between the partition plate 3 and the housing base, and the overload protection mechanism 2a, the operating mechanism 4 and the housing base are disposed in this order. Further, the miniature circuit breaker of the present invention comprises two second line inlet terminals 3 respectively disposed at both sides of the partition plate 3.

Preferably, as shown in fig. 1, 2 and 5, the operating mechanism 4 is an embodiment, which is as follows: the operating mechanism 4 comprises a second connecting rod 45, a handle piece 44, a rotating plate 43, a jump buckle piece 42 and a lock buckle piece 41, the handle piece 44 and the rotating plate 43 are respectively and rotatably arranged on the breaker shell 2, the lock buckle piece 41 and the jump buckle piece 42 are respectively and rotatably arranged on the rotating plate 43 and matched with each other in a lock buckle way, the handle piece 44 is in driving connection with the lock buckle piece 41 through the second connecting rod 45, and the rotating plate 43 is in driving connection with the static contact 1-0 a; the operating button 1 is drivingly connected to the handle member 44 via a first link 46.

It should be noted that the structure of the operating mechanism 4 is not limited to the above one, and the existing multi-link type operating mechanism that realizes multi-link balance by the latch cooperation of at least two components can be applied to the miniature circuit breaker of the present application.

Preferably, as shown in fig. 1, 2 and 5, the trip device 42 includes a trip device driven column 40 respectively driving and cooperating with the overload protection mechanism 2a and the short-circuit protection mechanism 6, when the miniature circuit breaker has an overload fault or a short-circuit fault, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the trip device 42 to rotate through the trip device driven column 40 and release the latch cooperation with the latch 41, so that the miniature circuit breaker is opened. Further, as shown in fig. 1 and 2, the middle of the jump buckle actuated column 40 is connected to a jump buckle element 42, one end of the jump buckle actuated column 40 is in driving fit with the overload protection mechanism 2a, and the other end is in driving fit with the short-circuit protection mechanism 6. Further, as shown in fig. 1, 2 and 5, the overload protection mechanism 2a and the short-circuit protection mechanism 6 are directly in driving fit with the jump buckle driven column 40 from one side, and the jump buckle piece 42 is driven to rotate by the jump buckle driven column 40 and is released from locking fit with the locking piece 41.

Specifically, as shown in fig. 1 and 2, the directions of the upper, lower, left, right sides and the side facing the reader of fig. 1 and 2 are the upper, lower, left, right and front sides of the miniature circuit breaker; the front end of the jump buckle driven column 40 is in driving fit with the overload protection mechanism 2a, and the rear end is in driving fit with the short-circuit protection mechanism 6; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are matched with the jump buckle driven column 40 in a driving mode from the lower side of the jump buckle driven column.

Preferably, as shown in fig. 1, 2 and 5, the overload protection mechanism 2a includes a bimetal 23a in driving fit with the trip catch actuated post 40.

Preferably, as shown in fig. 1 and 2, the short-circuit protection mechanism 6 is a clapper type electromagnetic mechanism, and includes an armature 60 in driving fit with the trip catch actuated post 40. Further, as shown in fig. 1 and 2, the miniature circuit breaker of the present invention further comprises a driving link 5, wherein the middle of the driving link 5 is rotatably disposed on the breaker housing 2, and two ends of the driving link are respectively in driving engagement with the armature 60 and the trip catch actuated post 40.

Preferably, as shown in fig. 5, the short-circuit protection mechanism 6 is a direct-acting electromagnetic mechanism, and includes a top rod in driving fit with the jump buckle driven column 40.

Preferably, as shown in fig. 1, 2, 5 and 9A, the first embodiment of the overload protection mechanism 2a is as follows: the overload protection mechanism 2a comprises a first conductive plate 20a, a second connection plate 22a and a bimetallic strip 23a, wherein two ends of the first connection plate 22a are respectively connected with the first conductive plate 20a and the bimetallic strip 23 a; the bimetallic strip 23a is connected with the first conductive plate 20a through a first flexible connection 240a and is connected with the static contacts 1-0a through a second flexible connection 241 a; the first conductive plate 20a is connected to the static contacts 1-0a through a third flexible connection 242 a. Further, as shown in fig. 9A, the first connection plate 22a has one end connected to the middle of the first conductive plate 20a and the other end connected to one end of the bimetal 23 a. Further, as shown in fig. 9A, the first connecting plate 22a and the bimetal 23a are integrally formed into a C-shaped structure, an open side of the C-shaped structure faces the operating mechanism 4, and the first conductive plate 20a and the fixed contacts 1 to 0a are disposed on the other side of the C-shaped structure. Further, one end of the first conductive plate 20a is connected to an external load through the second terminal 3a, and the other end is opposite to one end of the static contact plate 1-00a of the static contact 1-0 a.

Preferably, as shown in fig. 9A, the overload protection mechanism 2a further includes an adjusting screw 21a, the adjusting screw 21a is disposed on the first conductive plate 20a and is in threaded connection therewith, and one end of the adjusting screw 21a is opposite to and matched with the first connecting plate 21 a. Further, as shown in fig. 1, the circuit breaker housing 2 further includes an operation hole 22 corresponding to the other end of the adjustment screw 21a, and a user can screw the adjustment screw 21a through the operation hole 22 to adjust the overload protection characteristic of the overload protection mechanism.

Preferably, as shown in fig. 1, 2 and 9A, the first conductive plate 20 has a zigzag structure, and includes a first conductive plate connection portion connected to the second terminal 3a, a second conductive plate connection portion connected to the first connection plate 22a, and a third conductive plate connection portion connected to the fixed contacts 1-0a through a third flexible connection 242 a; and two ends of the second current-conducting plate connecting part are respectively bent and connected with the first current-conducting plate connecting part and the third current-conducting plate connecting part, and the first current-conducting plate connecting part and the third current-conducting plate connecting part are respectively positioned on two sides of the second current-conducting plate connecting part. As shown in fig. 9A, the adjusting screw 21a is provided on the second conductive plate connecting portion to be screwed therewith, and one end of the adjusting screw 21a is connected to the middle of the first connecting plate 22 a.

Preferably, as shown in fig. 9A and 9B, the static contact 1-0a includes a static contact plate 1-00a and a static contact 1-01a disposed at one end of the static contact plate 1-00a, the static contact plate 1-00a is connected to the bimetal 23a through a second flexible connection 241a, and the first conductive plate 20a and the static contact plate 1-00a are connected through a third flexible connection 242 a.

Specifically, as shown in the orientation of fig. 1 and 2, the overload protection mechanism 2a is assembled into the circuit breaker housing 2 and is in driving engagement with the operating mechanism 4; the upper end of the first conductive plate 20a is connected with an external load through the second terminal 3a, the lower end of the first conductive plate is opposite to the upper end of the static contact plate 1-00a of the static contact 1-0a, and the first conductive plate 20a and the static contact 1-00a are connected through the third flexible connection 242 a; the upper end of the first connecting plate 22a is connected with the middle part of the first conductive plate 20a, the lower end is connected with the upper end of the bimetallic strip 23a, the adjusting screw 21a is arranged in the middle part of the first conductive plate 20a and is in threaded connection with the first conductive plate, the right end of the adjusting screw 21a is relatively matched with the middle part of the first connecting plate 22a, and the circuit breaker shell 2 is provided with an operating hole 22 which is relatively matched with the left end of the adjusting screw 21 a; the lower end of the bimetallic strip 23a is located at the lower side of the trip catch actuated post 40 of the operating mechanism 4 and is in driving fit with the trip catch actuated post.

Preferably, as shown in fig. 9B, a second embodiment of the overload protection mechanism 2a is different from the first embodiment in that: no third flexible connection 242a is provided between the first conductive plate 20a and the static contacts 1-0 a.

Preferably, as shown in fig. 1-2 and 6-8, the short-circuit protection mechanism 6a of the miniature circuit breaker of the present invention is a clapper type electromagnetic mechanism, and the following is an embodiment thereof: the short circuit protection mechanism 6 comprises a magnetic yoke 61, an armature 60, an armature tension spring 63 and a conductive plate 64, wherein the conductive plate 64 is arranged in the middle of the magnetic yoke 61, one end of the armature 60 is rotatably arranged, the armature 60 is matched with the magnetic yoke 61 relatively, one end of the armature tension spring 63 is connected with the armature 60, and the other end of the armature tension spring is connected with the circuit breaker shell 2.

Preferably, as shown in fig. 1-2 and 6-7, the axis of the armature extension spring 63 is at an acute angle to the axis of the armature 60. Further, as shown in fig. 7, when the armature 60 is attracted to the yoke 61, an included angle between an axis of the armature tension spring 63 and an axis of the armature 60 is α, and α is greater than or equal to 3 ° and less than or equal to 30 °.

Preferably, as shown in fig. 6, the armature 60 includes a plurality of suspension spring holes, and the plurality of suspension spring holes are arranged side by side at intervals, and sequentially offset in the direction of the armature tension spring 63 from the first to the last suspension spring hole.

Preferably, as shown in fig. 1 and 2, when the short-circuit protection mechanism 6 is assembled in the circuit breaker housing 2, the axis of the yoke 61 is parallel to the axial direction of the circuit breaker housing 2 (the length direction of the circuit breaker housing 2).

Preferably, as shown in fig. 8, an embodiment of the cooperation of the armature 60, the yoke 61, the armature 60 and the yoke 61 is specifically: the magnetic yoke 61 is of a U-shaped structure and comprises a magnetic yoke bottom plate 612 and a pair of magnetic yoke arms 611, the two magnetic yoke arms 611 are respectively connected with two ends of the magnetic yoke bottom plate 612 in a bending manner, one end of each magnetic yoke arm 611 is provided with an armature clamping groove 610, and the two armature clamping grooves 610 are located at the same end of the magnetic yoke 61; the armature 60 comprises two armature supporting arms 600 arranged at one end of the armature 60 and arranged side by side at intervals, a limiting square groove 6000 is arranged at one end of each armature supporting arm 600, and the two limiting square grooves 6000 are respectively located at two ends of the two armature supporting arms 600 and are respectively matched with the two armature clamping grooves 610. Further, as shown in fig. 8, the two armature supporting arms 600 are integrally formed into a convex structure, the narrow end of the convex structure is limited between the two yoke arms 611, and the two shoulders of the convex structure are clamped in the two armature clamping grooves 610.

Preferably, as shown in fig. 8, the armature 60 includes an opening 65 disposed in a middle portion thereof, and three suspension spring holes, namely a first suspension spring hole 65-0, a second suspension spring hole 65-1 and a third suspension spring hole 65-2, are disposed on one side of the opening 65, and are sequentially disposed side by side at intervals along a length direction of the armature 60. Further, as shown in fig. 8, one end of each of the suspension spring holes is communicated with the opening 65, so that the armature tension spring 63 can be conveniently moved into or moved out of the suspension spring hole.

Specifically, as shown in fig. 1 and 2, when the short-circuit protection mechanism 6 is assembled to the circuit breaker housing 2 and is in driving engagement with the operating mechanism 4: the short-circuit protection mechanism 6 is arranged below the operating mechanism 4, the driving link 5 is arranged between the operating mechanism 4 and the short-circuit protection mechanism 6, and the upper end and the lower end of the driving link are respectively in driving fit with the trip catch driven column 40 of the operating mechanism 4 and the armature 60 of the short-circuit protection mechanism 6; when the miniature circuit breaker is in a short-circuit fault, the armature 60 swings anticlockwise, the driving link rod 5 swings clockwise, and the driving link rod 5 drives the tripping driven column 40 to rotate from the lower side of the tripping driven column. Further, as shown in fig. 1 and 2, the drive link 5 includes a link main body and a link shaft mounting portion provided at one side of a middle portion of the link main body.

Preferably, as shown in fig. 1, 2, 5, 11-13, the miniature circuit breaker of the present invention further comprises a signal output assembly 8, wherein the operation button 1 and the first terminal 7 are respectively disposed at two ends of the breaker housing 2, the second terminal 3a is disposed at the same end of the breaker housing 2 as the operation button 1, the signal output assembly 8 and the first terminal 7 are disposed at the same end of the breaker housing 2, the signal output assembly 8 is disposed between the two first terminals 7 which are spaced side by side, and the two first terminals 7 are respectively used for connecting the L pole and the N pole.

Preferably, as shown in fig. 11 to 13A, the first embodiment of the signal output assembly 8 specifically includes: the signal output assembly 8 comprises a printed circuit board 80, and a first signal end 83, a second signal end 82, a contact terminal 81, a current limiting resistor 85 and a diode 84 which are respectively arranged on the printed circuit board 80 and are respectively electrically connected with the printed circuit board 80; the current limiting resistor 85 is connected in series between the first signal terminal 83 and the contact terminal 81, and the diode 84 is connected in series between the second signal terminal 82 and the contact terminal 81; the contact terminal 81 is used for electrically connecting with an output terminal, and the first signal terminal 83 and the second signal terminal 82 are used for outputting an electrical signal, in this embodiment, the second terminal 3a is used as the output terminal, the first terminal 7 is connected with the movable contact 1-1a, and the contact terminal 81 is connected with the fixed contact 1-0 a. Further, as shown in fig. 1 and 3, the miniature circuit breaker of the present invention further includes an arc striking plate 4a disposed at one side of the arc extinguishing chamber 9, wherein one end of the arc striking plate 4a is connected to the stationary contact 1-0a, and the other end is connected to the contact terminal 81. It should be noted that the connection of the first signal terminal 83, the current limiting resistor 85 and the contact terminal 81, and the connection of the second signal terminal 82, the diode 84 and the contact terminal 81 are all implemented by the printed circuit board 80, which is a conventional technical means for those skilled in the art, and will not be described herein again.

Preferably, as shown in fig. 13A, the diode 84 has an anode connected to the contact terminal 81 and a cathode connected to the second signal terminal 82.

Preferably, as shown in fig. 11-12, the first signal terminal 83 and the second signal terminal 82 are spaced side-by-side on one side (front and back sides) of the printed circuit board 80, and the contact terminal 81, the current limiting resistor 85 and the diode 84 are disposed on the other side (opposite or front side) of the printed circuit board 80.

Preferably, as shown in fig. 11-12, the first signal end 83, the second signal end 82, and the contact terminal 81 are plug type terminals. Further, as shown in fig. 11 to 12, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 have the same structure, and each of the first signal terminal, the second signal terminal and the contact terminal includes a terminal base plate and two opposite terminal clamping plates, the two terminal clamping plates are respectively connected with two ends of the terminal base plate in a bending manner, and the middle portions of the two terminal clamping plates are protruded in opposite directions, so that the whole body has an X-shaped structure. Further, as shown in fig. 11-12, the direction of insertion of the conductive wires or plates into the first and second signal terminals 83 and 82 is perpendicular to the direction of insertion of the conductive wires or plates into the contact terminals 81.

Preferably, as shown in fig. 1 to 4, when the signal output assembly 8 is assembled to the circuit breaker housing 2, the printed circuit board 80 is perpendicularly inserted on the circuit breaker housing 2 along the thickness direction of the circuit breaker, and the printed circuit board 80 is perpendicular to the axial direction of the circuit breaker housing 2 (the length direction of the circuit breaker housing 2). Further, the first signal end 83 and the second signal end 82 are arranged side by side, and the plugging direction of the first signal end 83 and the second signal end 82 is parallel to the length direction of the circuit breaker housing 2; the plugging direction of the contact terminal 81 is perpendicular to (or parallel to) the plugging direction of the first signal terminal 83 and the second signal terminal 82, the plugging direction of the printed circuit board 80 is the same as the plugging direction of the printed circuit board 80, and the length direction of the printed circuit board 80 is perpendicular to the length direction of the circuit breaker housing 2, so that the plugging of the printed circuit board 80 and the arc striking plate 4a is realized while the printed circuit board 80 is mounted.

Further, as shown in fig. 3-4, the circuit breaker housing 2 includes a signal output assembly mounting structure located between the two first terminals 7, specifically: the signal output assembly mounting structure comprises a pair of circuit board slots 2-80, first assembly assembling spaces 2-81 and second assembly assembling spaces which are oppositely arranged at intervals, two ends of the printed circuit board 80 are respectively inserted into the two circuit board slots 2-80, and the first assembly assembling spaces 1-81 and the second assembly assembling spaces are respectively positioned at two sides of the printed circuit board 80; the contact terminal 81, the current limiting resistor 85 and the diode 84 are all located in the first assembly mounting space 2-81, the first signal terminal 83 and the second signal terminal 82 are all located in the second assembly mounting space, and the end of the arc ignition plate 4a, which is mated with the contact terminal 81, extends into the first assembly mounting space 2-81. Further, as shown in fig. 4, the insertion port of each of the circuit board slots 2-80 is provided with a guiding slope for facilitating the insertion of the printed circuit board 80, the inner end of the circuit board slot 2-80 is provided with a positioning rib 2-800, the printed circuit board 80 is inserted into the circuit board slot 2-80 to abut against the positioning rib 2-800, and the printed circuit board 80 is ensured to be installed in place; as shown in fig. 4, the second assembly mounting space includes two terminal mounting cavities arranged side by side, a terminal spacer 82-83 is provided between the two terminal mounting cavities, a plurality of terminal support ribs 2-820 are provided at the bottom of each terminal mounting cavity, and each terminal mounting cavity is oppositely matched with one signal jack 2-82 provided on the circuit breaker housing 2.

Preferably, as shown in fig. 13B, a second embodiment of the signal output assembly 8 is different from the first embodiment in that: the second signal terminal 82 is connected to the contact terminal 81 through a diode 84, a current limiting resistor 85 and a contact terminal 81 connected in series, and the first signal terminal 81 is connected to the contact terminal 81 through the current limiting resistor 85 (the first signal terminal 81 is connected to a node between the current limiting resistor 85 and the contact terminal 81).

Preferably, as shown in fig. 14 to 29, the miniature circuit breaker of the present invention further comprises a PCB board 7 and a conductive structure, the PCB board 7 being disposed in the breaker housing 2 and including the signal lamp 8a, the conductive structure including a light guide member 5a and a viewing hole, the light guide member 5a having one end fitted opposite to the signal lamp 8a and the other end fitted opposite to the viewing hole. Further, as shown in fig. 15, 16, 19, 20, 24, 25, 27-29, the light guide element 5a includes at least one reflecting surface for reflecting light emitted from the signal lamp 8a, and the light emitted from the signal lamp 8a reaches the observation hole after being reflected at least once. Further, as shown in fig. 15, 16, 19, 20, 24, 25, 27-29, the light emitted from the signal light 8a enters the light guide element 5a, and is reflected for 2n +1 times and then exits the light guide element 5a, n is a natural number, and preferably 1 or 3.

Preferably, as shown in fig. 15, 16, 19, 20, 24, 25, 27-29, the direction in which the light emitted from the signal lamp 8a enters the light guide element 5a is a first direction, and the direction in which the light emitted from the signal lamp 8a exits the light guide element 5a is a second direction, the first direction being perpendicular to the second direction, and the first direction being perpendicular to the axial direction of the light guide element 5 a.

Preferably, the light guide element 5a is a total reflection light guide element, which can transmit most of the light emitted from the signal lamp 8a into the observation hole.

Preferably, as shown in fig. 14 to 25, a first embodiment of the conducting structure is specifically: the observation hole comprises a button observation hole 101 arranged on the operating button 1, the light guide element 5a is linked with the operating button 1, one end of the light guide element is matched with the signal lamp 8a relatively, and the other end of the light guide element is matched with the button observation hole 101 relatively. Further, as shown in fig. 15, 19, 24 and 25, the operation button 1 includes a first fitting cavity 100 provided in a middle portion thereof and extending in an axial direction of the operation button 1, the light guide member 5a is provided in the first fitting cavity 100, and a button viewing hole 101 is provided at one end of the operation button 1 to communicate with the first fitting cavity 100.

Preferably, as shown in fig. 16 and 20, a first embodiment of the light guide element 5a is specifically: the light guide element 5a comprises a light guide element body 5-0a, and a first reflecting surface 51a, a second reflecting surface 52a, a third reflecting surface 53a and a fourth reflecting surface 54a which are arranged on the light guide element body 5-0 a; the first reflecting surface 51a, the second reflecting surface 52a, the third reflecting surface 53a and the fourth reflecting surface 54a are all inclined surfaces which are all inclined towards the same direction; the first reflecting surface 51a, the second reflecting surface 52a and the third reflecting surface 53a are all arranged on one side of the light guide element main body 5-0a and are sequentially arranged at intervals along the axial direction of the light guide element main body 5-0a, and the first reflecting surface 51a, the second reflecting surface 52a and the third reflecting surface 53a are sequentially offset towards one side of the light guide element 5 a; the fourth reflecting surface 54a is disposed at the other side of the light guide element body 5-0a, and the third reflecting surface 53a and the fourth reflecting surface 54a are disposed at the same end of the light guide element body 5-0 a. Further, as shown in fig. 15 and 16, the miniature circuit breaker of the present invention is in the open state, and the light emitted from the signal lamp 8a enters the light guide element body 5-0a from one end of the light guide element body 5-0a, is reflected by the first reflecting surface 51a, the fourth reflecting surface 54a and the third emitting surface 53a in sequence, and then exits from the other end of the light guide element body 5-0a and is visible through the button viewing hole 101; as shown in fig. 19 and 20, when the miniature circuit breaker of the present invention is in a closed state, the operation button 1 drives the light guide element 5a to move downward, and the signal lamp 8a enters the light guide element 5-0a from one end of the light guide element 5-0a, is reflected by the second reflecting surface 52a, the fourth reflecting surface 54a and the third reflecting surface 53a in sequence, and then exits from the other end of the light guide element 5-0a and is visible through the button viewing hole 101.

Specifically, as shown in fig. 15-16, 19-20, and 24-25, the signal lamp 8a is disposed on the left side of the lower end of the light guide element 5a, and the upper end of the light guide element 5a is fitted opposite to the button viewing hole 101; as shown in fig. 19 and 24, when the small circuit breaker is closed by pressing the operating button 1, the light guide element 5a moves down with the operating button 1 so that the second emission surface 52a faces the signal lamp 8 a; as shown in fig. 15 and 25, when the operation button 1 is pulled to open the miniature circuit breaker, the light guide element 5a moves up along with the operation button 1, so that the first reflecting surface 51a and the signal lamp 8 a; the light emitted from the signal lamp 8a is always incident on the light guide element 5a from a direction perpendicular to the axial direction of the light guide element 5a, and is emitted from a direction parallel to the axial direction of the light guide element 5 a.

Preferably, as shown in fig. 15, 17-19, 21 and 22, the miniature circuit breaker of the present invention further comprises an indicator 6a disposed in the first assembly chamber 100 for indicating the opening/closing state of the miniature circuit breaker, the indicator 6a is linked with the operation button 1, the indicator 6a comprises light-transmissive indicator portions 61-62a, the indicator portions 61-62a comprise opening indicator surfaces 61a and closing indicator surfaces 62a disposed side by side, the indicator portions 61-62a are disposed between the light guide element 5a and the button observation hole 101, the closing indicator surfaces 62a are visible through the button observation hole 101 when the miniature circuit breaker is in the closing state, and the opening indicator surfaces 61a are visible through the button observation hole 101 when the miniature circuit breaker is in the opening state. Further, as shown in fig. 17, 18, 21, and 22, the miniature circuit breaker of the present invention further comprises an actuating member 9a disposed in the circuit breaker housing 1, the actuating member 9a including an indicator driving table 90 a; the indicating piece 6a further comprises an indicating piece rotating shaft 60a and an indicating piece driven part 63a, the indicating piece rotating shaft 60a and the indicating parts 61-62a are respectively located at two ends of the indicating piece 6a, the indicating piece driven part 63a is connected with the indicating piece rotating shaft 60a, the indicating piece 6a is rotatably arranged through the indicating piece rotating shaft 60a, and the indicating piece driving table 90a drives the indicating piece 6a to rotate through the indicating piece driven part 63 a. Further, the indicator 6a is rotatably connected to the operation button 1 via an indicator rotation shaft 60a, or the indicator 6a is rotatably connected to the light guide member 5a via an indicator rotation shaft 60 a. Further, as shown in fig. 15, 17-19, and 21-22, the light guide element 5a includes an indicator shaft mounting groove 50a, the indicator shaft mounting groove 50a is disposed between the second reflective surface 52a and the third reflective surface 53a and on the same side of the light guide element 5a as the second reflective surface 52a and the third reflective surface 53a, and the indicator shaft 60a is rotatably disposed in the indicator shaft mounting groove 50 a.

Preferably, as shown in fig. 17-18, 21-22 and 23, the indicator passive part 63a is of a C-shaped structure, and includes a closing driving part 630a and an opening driving part 631a respectively disposed at two ends thereof, a middle portion of the indicator passive part 63a is connected to the indicator rotating shaft 60a, an indicator driving stage 90a is disposed in the middle portion of the C-shaped structure of the indicator passive part 63a and is respectively in driving engagement with the closing driving part 630a and the opening driving part 631a, the indicator driving stage 90a pushes the closing driving part 630 to rotate the indicator 6a, the closing indicating surface 62a is visible through the button indicating hole 101, the indicator driving stage 90a pushes the opening driving part 631a to rotate the indicator 6a, and the opening indicating surface 61a is visible through the button indicating hole 101. The indicating piece driving platform 90a and the indicating piece driven part 63a are in driving fit in a mechanical mode, the action is reliable and stable, the indicating piece 6a switches the switching-on indicating surface 62a and the switching-off indicating surface 61a in a swinging mode, the action amplitude is large, the switching-off/switching-on state of the miniature circuit breaker is reliably and accurately indicated, and the power utilization safety of a user is improved.

Preferably, as shown in fig. 23, an embodiment of the indicator 6a specifically includes: the indicating part 6a comprises indicating parts 61-62a, an indicating part connecting part 64a, an indicating part rotating shaft 60a and an indicating part driven part 63a, the indicating parts 61-62a and the indicating part rotating shaft 60a are respectively connected with the indicating part connecting part 64a, one end of the indicating part rotating shaft 60a is connected with the indicating part connecting part 64a, the other end of the indicating part rotating shaft 60a is connected with the indicating part driven part 63a, the indicating parts 61-62a comprise closing indicating surfaces 62a and opening indicating surfaces 61a which are arranged side by side, two ends of the opening indicating surfaces 61a are respectively connected with the indicating part connecting part 64a and the closing indicating surfaces 62a, the indicating part driven part 63a is of a C-shaped structure, the middle part of the indicating part rotating shaft 60a is connected with the indicating part rotating shaft, and the indicating part rotating shaft comprises a closing driving part 630a and an opening driving part 631a which are respectively arranged at two ends of the indicating part rotating shaft. Further, as shown in fig. 23, the indicator connecting portion 64a has an L-shaped structure, the indicator connecting portion 64a and the indicating portions 61 to 62a are integrally formed into a U-shaped structure, the opening direction of the U-shaped structure is the same as the opening direction of the C-shaped structure of the indicator passive portion 63a, and the closing driving portion 630a is disposed adjacent to the indicating portions 61 to 62.

Preferably, as shown in fig. 26 to 29, a second embodiment of the conductive structure is different from the first embodiment in that: the observation hole comprises a shell observation hole 21 arranged on the breaker shell 2, the light guide element 5a is fixedly arranged in the breaker shell 2, one end of the light guide element is matched with the signal lamp 8a relatively, and the other end of the light guide element is matched with the shell observation hole 21 relatively or is inserted into the shell observation hole 21.

Preferably, as shown in fig. 26, 27 and 29, the circuit breaker housing 1 includes a circuit breaker operation interface 20 disposed at one end thereof, a housing observation hole 21 is disposed on the circuit breaker operation interface 20, and the operation button 1 is inserted into the circuit breaker housing 2 at one end and protrudes outside the circuit breaker operation interface 20 at the other end. Further, as shown in fig. 26 and 27, the miniature circuit breaker of the present invention further comprises a first wiring hole 203 and a first disconnection hole 2030 provided in the breaker operation interface 20, the first wiring hole 203 and the first disconnection hole 2030 being fitted one-to-one, and the first wiring hole 203 being fitted to the first terminal 3a one-to-one.

As shown in fig. 27 to 28, a second embodiment of the light guide element 5a specifically includes: the light guide element 5a includes a first reflection surface 51a disposed at one end thereof, the indicator light 8a is disposed at one side of the light guide element 5a, and the emitted light is incident into the light guide element 5a, reflected by the first reflection surface 51a, emitted out of the light guide element 5a and visible through the housing observation hole 21.

As shown in fig. 29 and 30, a third embodiment of the light guide element 5a specifically includes: the light guide element 5a comprises a first reflecting surface 51a, a second emitting surface 52a and a third reflecting surface 53a, the first reflecting surface 51a, the second emitting surface 52a and the third reflecting surface 53a are inclined planes inclined in the same direction and are parallel to each other, the first reflecting surface 51a and the third reflecting surface 53a are arranged on the same side of the light guide element 5a and are sequentially offset to one side of the light guide element 5a, the first reflecting surface 51a and the third reflecting surface 53a are respectively arranged at two ends of the light guide element 5a, the second reflecting surface 52a is arranged on the other side of the light guide element 51a and is opposite to the third reflecting surface 53a, and the second reflecting surface 52a and the third reflecting surface 53a are arranged at the same end of the light guide element 5 a; the indicator light 8a is disposed on one side of the light guide element 5a, and the emitted light enters the light guide element 5a, is reflected by the first reflecting surface 51a, the second reflecting surface 52a and the third reflecting surface 53a in sequence, exits the light guide element 5a, and is visible through the housing observation hole 21.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (9)

1. A miniature circuit breaker comprises a circuit breaker shell (2), an overload protection mechanism (2a) respectively arranged in the circuit breaker shell (2), a moving contact (1-1a) and a static contact (1-0a) which are used in a matched mode, and an operating mechanism (4); the overload protection mechanism (2a) is in driving fit with the operating mechanism (4), and the moving contact (1-1a) is in driving connection with the operating mechanism (4); the method is characterized in that:

the overload protection mechanism (2a) comprises a first conductive plate (20a), a first connecting plate (22a) and a bimetallic strip (23a), wherein two ends of the first connecting plate (22a) are respectively connected with the first conductive plate (20a) and the bimetallic strip (23 a); the bimetallic strip (23a) is connected with the first conductive plate (20a) through a first soft connection (240a) and is connected with the static contact (1-0a) through a second soft connection (241 a); and a third soft connection (242a) is optionally arranged between the first conductive plate (20a) and the fixed contact (1-0 a).

2. A miniature circuit breaker according to claim 1, wherein: the overload protection mechanism (2a) further comprises an adjusting screw (21a), the adjusting screw (21a) is arranged on the first conductive plate (20a) and is in threaded connection with the first conductive plate, and one end of the adjusting screw (21a) is matched with the first connecting plate (22a) relatively.

3. A miniature circuit breaker according to claim 2, wherein: the breaker shell (2) comprises an operation hole (22) corresponding to the other end of the adjusting screw (21 a); one end of the first connecting plate (22a) is connected with the middle part of the first conductive plate (20a), and the other end is connected with one end of the bimetallic strip (23 a).

4. A miniature circuit breaker according to claim 1, wherein: the static contact (1-0a) comprises a static contact plate (1-00a) and a static contact (1-01a) arranged at one end of the static contact plate (1-00a), and the static contact plate (1-00a) is connected with the bimetallic strip (23a) through a second flexible connection (241 a); a third flexible connection (242a) is optionally provided between the first conductive plate (20a) and the stationary contact plate (1-00 a).

5. A miniature circuit breaker according to claim 1 or 4, wherein: the first connecting plate (22a) and the bimetallic strip (23a) are integrally in a C-shaped structure, the opening side of the C-shaped structure faces the operating mechanism (4), and the first conducting plate (20a) and the static contact (1-0a) are arranged on the other side of the C-shaped structure; one end of the first conductive plate (20a) is connected with an external load through a second wiring terminal (3a), the other end of the first conductive plate is opposite to one end of a static contact plate (1-00a) of a static contact (1-0a), and a static contact (1-01a) is arranged at the other end of the static contact plate (1-00 a).

6. A miniature circuit breaker according to claim 1, wherein: the operating mechanism (4) comprises a handle piece (44), a second connecting rod (45), a rotating plate (43), a locking piece (41) and a tripping piece (42), the handle piece (44) and the rotating plate (43) are respectively and rotatably arranged on the shell (2) of the circuit breaker, the locking piece (41) and the tripping piece (42) are respectively and rotatably arranged on the rotating plate (43) and are matched in a locking way, and the handle piece (44) is connected with the locking piece (41) through the second connecting rod (45); the bimetallic strip (23a) is in driving fit with the snap fastener (42).

7. A miniature circuit breaker according to claim 6, wherein: the tripping piece (42) is of a V-shaped structure, the middle part of the tripping piece is rotatably arranged on the shell (2) of the circuit breaker, one end of the tripping piece is provided with a tripping driven column (40) which is in driving fit with the bimetallic strip (23a), and the other end of the tripping piece is in locking fit with the locking piece (41).

8. A miniature circuit breaker according to claim 7, wherein: the miniature circuit breaker further comprises a short-circuit protection mechanism (6), and the short-circuit protection mechanism (6) is in driving fit with the jump buckle driven column (40); the short-circuit protection mechanism (6) is a clapper type electromagnetic mechanism or a direct-acting type electromagnetic mechanism.

9. A miniature circuit breaker according to claim 1 or 6, wherein: the miniature circuit breaker further comprises an operating button (1), and one end of the operating button (1) is inserted into the circuit breaker shell (2) and is in driving connection with a handle piece of the operating mechanism (4) through a first connecting rod; the operating button (1) is pressed/pulled, and the small circuit breaker is switched on/off through the operating mechanism (4).

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